With Baby Sussex‘s arrival expected to be in late April to early May, the biggest and most dedicated royal admirers are gearing up for the big day. Since Meghan Markle and Prince Harry have kept pregnancy details very hush-hush, fans of the couple (and the royal family in general) have been dying to get a glimpse into their new lives as parents-to-be.

One of the most interesting things about Meghan, 37, and 34-year-old Harry’s relationship is the quick timeline of their romance. Although the couple began dating in November 2016 — Kensington Palace confirmed the relationship in a statement — the former Suits actress revealed to Vanity Fair in October 2017 that they first met in London during July 2016.

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A little over a year later, in November 2017, Harry got down on one knee and proposed with a three-diamond engagement ring, which includes two diamonds that used to belong to Princess Diana. After tying the knot at their lavish and highly publicized royal wedding in May 2018, the royal duo announced in October that Meghan was three months pregnant — which means they only waited about two months before getting pregnant with their first child.

If you couldn’t tell, being speedy is kind of their thing but, while Meghan and Harry’s romance took off to a quick start, you might be surprised to hear that they weren’t the only ones. In fact, many couples within the royal family wasted no time at all before getting down to business.

Scroll down through the gallery below to see how long each royal couple waited before having kids!